• 제목/요약/키워드: Mode Shape Variation

검색결과 83건 처리시간 0.036초

평판 위 구의 거동을 위한 강인 비주얼 서보잉 (Robust Visual Servoing to Control the Motion of a Sphere on a Plate)

  • 박종현;이영종
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 제어로봇시스템학회 2000년도 제15차 학술회의논문집
    • /
    • pp.226-226
    • /
    • 2000
  • This paper presents the control problem for the motion of sphere with robot manipulator. The robot manipulator is controlled to regulate the angle of plate for the sphere to track given trajectories on the plate. The center position of the sphere is measured with machine vision system and the advanced algorithm for center detection is proposed in which the change of shape is considered to solve the problem of image distortion. To cope with the variation of plate material and the structure of sphere (size, mass, etc.), sliding mode control, which has robustness to model uncertainty, is applied to the control of robot manipulator.

  • PDF

200 kW급 15,000 rpm 3상 유도전동기의 회전축 진동해석 (Rotating Shaft Vibration Analysis of 200 kW, 15,000 rpm 3 Phase Induction Motor)

  • 홍도관;구대현;우병철;홍승수;권용수;강헌찬;안찬우
    • 한국소음진동공학회:학술대회논문집
    • /
    • 한국소음진동공학회 2006년도 춘계학술대회논문집
    • /
    • pp.262-265
    • /
    • 2006
  • The purpose of this study is to design 200 kW, 15,000 rpm 3 phase induction motor. This research deals with natural frequency and mode shape of rotating shaft of 3 phase induction motor with bearing stiffness by finite element analysis. We present natural frequency characteristic variation of rotating shaft according to change bearing stiffness. Also we are verified stability of rotating shaft from backward and forward critical speed by campbell diagram.

  • PDF

병진 가속도 운동을 하는 외팔평판의 진동해석 (Vibration Analysis of Cantilever Plates Undergoing Translationally Accelerated Motion)

  • 김성균;유홍희
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2001년도 춘계학술대회논문집B
    • /
    • pp.349-354
    • /
    • 2001
  • A structure which is accelerated in the chordwise direction induces variation of the bending stiffness due to inertia force. Thus, the characteristic of natural vibration is also changed. This paper presents a modeling method for the vibration analysis of translationally accelerated cantilever plates. The dependence of natural frequencies and modes on the acceleration changes of the plate is investigated. Particularly, a natural frequency loci veering is observed and discussed in the present study.

  • PDF

차체구조용 박육단면부재의 단면형상변화에 따른 축압궤 특성에 관한 연구 (A Study on the Axial Collapse Characteristics of Thin-Walled Members for Vehicles on the Variation of Section Shapes)

  • 이길성;백경윤;차천석;정진오;양인영
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2003년도 춘계학술대회 논문집
    • /
    • pp.1549-1552
    • /
    • 2003
  • The front-end side members of automobiles absorb most of the energy in a front-end collision. The front-end side members are required to have a high stiffness together with easiness to collapse sequentially to absorb more impact energy. The axial static collapse test (5mm/mim) was conducted by using UTM with respect to the single hat shaped section members which are the standard section shape of the spot welded section members, to the single cap shaped section members, to the double cap shaped section members and to the double hat shaped section members whose section shape are changed in order to give more stiffness. As a result of test, the energy absorbing characteristic was analyzed for different section shapes. That is, it was analyzed that the change of section shape influenced the absorbing energy, the mean collapse load and the maximum collapse load, and that the relation between the change of section shape and the collapse mode.

  • PDF

관막음된 증기발생기 전열관의 유체유발진동 특성 평가 (Estimation of Flow-induced Vibration characteristics on Plugged Steam Generator)

  • 조봉호;유기완;박치용;박수기
    • 한국소음진동공학회:학술대회논문집
    • /
    • 한국소음진동공학회 2002년도 추계학술대회논문집
    • /
    • pp.921-926
    • /
    • 2002
  • In this study, we investigate the plugging effect on the CE type steam generator tube. The natural frequency and mode shape will be changed due to decrease of the effective mass distribution along the tube. We compared the variation of stability ratio for plugged tube with that for unplugged one. The natural frequency increased because of removing the cooling water inside the steam generator tube, but the stability ratio decreased inversely because of changing the vibrational model shape. We also investigated the turbulent excitation effect.

  • PDF

고속충격시 볼탄에 의한 알루미늄 합금의 관통 깊이와 형상에 관한 실험적 연구 (The experimental investigation for penetration depth and shape of aluminum alloy plates by 5.56mm ball projectile with striking velocities between 350 and 750㎧)

  • 손세원;김희재;김영태
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2002년도 추계학술대회 논문집
    • /
    • pp.800-803
    • /
    • 2002
  • This investigation describes and analyses the experimental results proper to the penetration of Al5052-H34 alloy plates of thickness 6, 12 and 16mm(T/D=1, 2, 3) by 5.56mm ball projectiles over the velocity range 350-750㎧. All the high velocity impact tests were carried out at normal impact angle, i.e. zero obliquity. The experimental results presented the variation of depth of penetration, bulge height and diameter, plugged length and diameter with the velocity fur tests on each plate of a given thickness in order to determine the deformation shapes of 5.56mm ball projectiles and targets. Also the protection ballistic limit($V_50$) tests were conducted.

  • PDF

ADJOINT METHOD FOR CONTROLLED CAVITATION INVERSE NOZZLE DESIGN

  • Petropoulou, S.;Gavaises, M.;Theodorakakos, A.
    • International Journal of Automotive Technology
    • /
    • 제7권3호
    • /
    • pp.283-288
    • /
    • 2006
  • A mathematical methodology is proposed for designing nozzle hole shapes producing controlled geometric cavitation. The proposed methodology uses an unstructured RANS flow solver, with the ability to compute sensitivity derivatives via an adjoint algorithm. The adjoint formulation for the N-S equations is presented while variation of the turbulence viscosity is not taken into account during the geometry modifications. The sensitivities are calculated in a mode independently of the shape parameterisation. The method is used to develop and evaluate conceptual shapes for nozzle hole cavitation reduction. The localized region at the hole inlet producing cavitation, is parameterised using its radius of curvature, while a cost function is formulated to eliminate the negative pressures present at this location. Sensitivity derivatives are used to assess the dependence of the localized region on the minimum pressure, and to drive the geometry to the targeted shape. The results show that the computer model can provide nozzle hole entry shapes that produce predefined flow characteristics, and thus can be used as an inverse design tool for nozzle hole cavitation control.

철도차량용 스위치드 릴럭턴스 전동기의 설계 및 속도제어에 관한 연구 (A Study on the Design and Speed Control of the Switched Reluctance Motor for Railway Traction Application)

  • 조희;김경화
    • 한국철도학회논문집
    • /
    • 제15권3호
    • /
    • pp.237-243
    • /
    • 2012
  • 3차원 유한요소법을 이용하여 엔드코일 효과를 고려한 SRM의 자계해석을 수행하였다. 고정자 극 형상에 따른 자계특성의 비교를 통하여 제안된 형상에서 자계특성이 향상됨을 확인하였다. 해석한 자계특성을 적용하여 철도부하에 대한 PI 제어기와 슬라이딩모드 제어기의 속도제어를 수행하였다. 속도 제어 시뮬레이션은 Matlab-Simulink를 사용하여 구현되었으며 부하 가변 조건에서 슬라이딩모드 제어기가 PI 제어기에 비해 더 우수한 과도응답 및 정상상태응답을 나타냄을 확인하였다.

5패드 틸팅 패드 베어링의 설계 조건 변화가 소형 가스터빈의 횡진동 특성에 미치는 영향 (Effects of Design Conditions in Five Pad Tilting Pad Bearing on the Lateral Vibration Characteristics of Small Gas Turbine)

  • 하진웅;명지호;석진익;이안성;김영철
    • 한국소음진동공학회논문집
    • /
    • 제21권8호
    • /
    • pp.752-760
    • /
    • 2011
  • In tilting pad bearing design process, the selection of the proper configuration type of either a load-between-pad(LBP) or load-on-pad(LOP) as well as preload and pivot offset conditions is to be carefully considered. Also the bearing needs to be designed in order to be suited for the rotor-bearing system and operating condition. In this paper, it is observed that the dynamic characteristics in a five pad tilting pad bearing for the LBP and the LOP configurations are influenced by the variation of preload and pivot offset. In this context, rotor dynamic analysis of the 5 MW industrial gas turbine supported by the tilting pad bearing at the front and roller bearing at the rear is carried out based on the dynamic coefficients of the tilting pad bearing investigated. The result shows that two rigid body critical modes experience various changes according to the influence of the tilting pad bearing uniquely applied to one side of this machine. Mainly, the second critical speed, the rigid body mode of conical shape with high whirling in the tilting pad bearing, is significantly changed by preload and pivot offset regardless of the LBP and LOP configurations. And, the first critical mode, the rigid body mode of conical shape with high whirling in the roller bearing, is sensitively affected by preload applied to the LOP configuration and by its asymmetric dynamic properties.

5패드 틸팅 패드 베어링의 설계 조건 변화가 소형 가스터빈의 횡진동 특성에 미치는 영향 (Effects of Design Conditions in Five Pad Tilting Pad Bearing on the Lateral Vibration Characteristics of Small Gas Turbine)

  • 하진웅;명지호;석진익;이안성;김영철
    • 한국소음진동공학회:학술대회논문집
    • /
    • 한국소음진동공학회 2011년도 춘계학술대회 논문집
    • /
    • pp.425-432
    • /
    • 2011
  • In tilting pad bearing design process, the selection of the proper configuration type of either a Load-Between-Pad (LBP) or Load-On-Pad (LOP) as well as preload and pivot offset conditions is to be carefully considered. Also the bearing needs to be designed in order to be suited for the rotor-bearing system and operating condition. In this paper, it is observed that the dynamic characteristics in a 5 pad tilting pad bearing for the LBP and the LOP configurations are influenced by the variation of preload and pivot offset. In this context, rotor dynamic analysis of the 5MW industrial gas turbine supported by the tilting pad bearing at the front and roller bearing at the rear is carried out based on the dynamic coefficients of the tilting pad bearing investigated. The result shows that two rigid body critical modes experience various changes according to the influence of the tilting pad bearing uniquely applied to one side of this machine. Mainly, the second critical speed, the rigid body mode of conical shape with high whirling in the tilting pad bearing, is significantly changed by preload and pivot offset regardless of the LBP and LOP configurations. And, the first critical mode, the rigid body mode of conical shape with high whirling in the roller bearing, is sensitively affected by preload applied to the LOP configuration and by the its asymmetric dynamic properties.

  • PDF